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All Journal Jurnal technoscientia Jurnal Teknologi JURNAL TEKNOLOGI TECHNOSCIENTIA
Khairul Muhajir
Jurusan Teknik Mesin, Institut Sains & Teknologi AKPRIND Yogyakarta
Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Journal : JURNAL TEKNOLOGI TECHNOSCIENTIA

 1 
KONDUKTIVITAS TERMAL PAPAN PARTIKEL SEKAM PADI Wibowo, Hary; Muhajir, Khairul; Rusianto, Toto; Arbintarso, Ellyawan
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscentia Vol 1 No 1 Agustus 2008
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v1i1.375

Abstract

People have used rice husk as an isolator material to prevent melting block of ice by pour it to the block of ice. Rice husk as particle board have been developed as an alternative of isolator material especially for cold storage. Thermal conductivity was affected by many aspects; one of them is filler solid compression ratio. The value of thermal conductivity in the rice husk particle boards has been researched to thermal conductivity with modified of ASTM C177 method and with different solid comparison are: 6-1, 5-1, 4-1, 3-1 i.e from original thick to final thick. From the different of the value of thermal conductivity which was from every density, it was found that the highest value of the thermal conductivity was obtained on rice husk particle board with the density of 3-1 with the value of thermal conductivity 0,133 w/m°C on heat source 70 watt and 0,103 w/m°C on heat source 80 watt and the lowest value of the thermal conductivity was density with 6-1 with the value of thermal conductivity 0,096 w/m°C on heat source 70 watt and 0,082 w/m°C on heat source 80 watt.
ANALISA PERBANDINGAN PENGUKURAN TEKANAN ANNULUS TEORI DAN LANGSUNG PADA PROSES PENGEBORAN MINYAK BUMI Muhajir, Khairul; Sentono, Sugijarto Prawiro; Taufik, Esa
JURNAL TEKNOLOGI TECHNOSCIENTIA Technoscientia Vol 4 No 2 Februari 2012
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34151/technoscientia.v4i2.511

Abstract

In oil drilling process, the application of pressure measurements in in space between formation borehole and drill pipe (annulus) is very important. The correlation of predicted and measured annulus pressures is a very complex. The engineer’s knowledge of oil drilling process is very important to understand annulus pressure change and their effects will influence the accuracy of annulus pressure predictions. Factors that should be considered include the monitoring and collection of rig-site information such as density, viscosity of mud, drilling depth, flow rate, and drill pipe rotation. The author collects the data and made the analysis with supporting documents. The research concludes that there are differences between predicted and measured annulus pressure. The most dominant factor is mud density that measured on surface and the one in the bore hole. The mud density in the borehole is influences by another material from rubbish and cutting. The equation is not corrected by the influences of that another material. The higher of percentage of rubbish in the bore hole will be caused the higher of mud density; hence the ECD and annulus pressure will be higher also. The amount of rubbish also influenced by viscosity, flow rate, and drill pipe rotation.
KARAKTERISASI ALIRAN GAS-CAIR FLUIDA VISKOS SEARAH PADA BELOKAN PIPA HORISONTAL Muhajir, Khairul
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 11 Edisi Khusus Oktober 2006
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

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Abstract

ABSTRACT This study aims to discover the pressure distribution as well as flow patterns taking place at a U-pipe bend with the elbow angle (j) of 180o and oblique angle variations (q) of 0o or horizonta. The study was conducted using air-glycerine flow at room temperature (27oC – 30oC). Air flow rates have four variations (2,3599E-05; 3,9331E-05; 5,5064E-05; 7,0796E-05) m3/s and glycerine flow rates have five variations (4,101E-04; 4,921E-04; 5,741E-04; 6,561E-04; 7,381E-04) m3/s. At first, glycerol was channelled with constant flow, then air was channelled with the first flow until fourth flow. Then glycerol flow was raised from the second to fifth flow, while air flow starting from first flow to fourth flow, respectively. The test section diameter is 25 mm and the bend radius is 175 mm, or R/D = 7.The study results indicated that on the single-phase flow, the greatest pressure distribution occurred on the outer side, specially on the bank position the greatest pressure distribution was on the bottom side bend, while for the two-phase flow the greatest pressure distribution also occurred on the outer wall and specially on the bank posision the greatest pressure distribution was on the top side bend. Flow patterns occurred are bubble flow, plug flow, stratified flow, stratified wave flow, slug flow, and annular flow. This reseach to show that in two phase viscous fluid flow must be don’t use the U pipe bend in order to prevent the losses.
PENGARUH PEMAKAIAN BEBERAPA CAMPURAN BAHAN BAKAR TERHADAP EMISI GAS BUANG MOTOR BENSIN 4 TAK Muhajir, Khairul
JURNAL TEKNOLOGI TECHNOSCIENTIA Academia Ista Vol 11 Edisi Khusus Oktober 2006
Publisher : Lembaga Penelitian & Pengabdian Kepada Masyarakat (LPPM), IST AKPRIND Yogyakarta

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Abstract

This study aims to discover the exhaust gas emission effect in the combustion chamber of four strokes spark ignition engine taking place at using of ethanol and pertamax fuel at combustion process and exit at the air. The research was conducted at using of ethanol and pertamax fuel in the four strokes of spark ignition engine at KIA CARNIVAL car at the amospheric condition ( 27o C – 30o C ).Exhaust gas emission producted from combustion process the so called poluttant result from engine with premium fuel as (HC,CO,CO2,O2,NOx). Among the cause of incomplete combustion is the poor of oxygen, so in order not to be discover the dangerous exhaust gas emission, the ethanol added at the fuel mixture.This study analysed the effect of athanol added to pertamax fuel mixture with exhaust gas emission. The methode of study with comparing pure pertamax fuel and ethanol pertamax fuel mixture with concentred of 9 % and 16.6 %, at the engine rpm speed of 1000, 2000, 3000 and 4000. and used the exhaust gas emission measurement with the ultra gas analyser.The result of this study show there are exhaust gas emission decrease at every ethanol added in to the pertamax fuel mixture, and there are also increase of fuel to air ratio. The ethanol fuel helps the combustion process because there are oxygen (O2) in the ethanol fuel, so that the ethanol fuel could be the alternative of fuel to decrease the dangerous of exhaust gas emission and to increase the octane number whatever needs at the fuel car engine with grade capacity.
Co-Authors Arbintarso, Ellyawan Setyo Hary Wibowo, Hary Nopias, Bonyfasius Sentono, Sugijarto Prawiro Sentono, Sugijarto Prawiro Taufik, Esa Taufik, Esa Toto Rusianto